Functionalized Nanocellulose-Integrated Heterolayered Nanomats toward Smart Battery Separators

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Abstract
Alternative materials obtained from natural resources have recently garnered considerable attention as an innovative solution to bring unprecedented advances in various energy storage systems. Here, we present a new class of heterolayered nanomat-based hierarchical/asymmetric porous membrane with synergistically coupled chemical activity as a nanocellulose-mediated green material strategy to develop smart battery separator membranes far beyond their current state-of-the-art counterparts. This membrane consists of a terpyridine (TPY)-functionalized cellulose nanofibril nanoporous thin mat as the top layer and an electrospun polyvinylpyrrolidone (PVP)/polyacrylonitrile (PAN) macroporous thick mat as the support layer. The hierarchical/asymmetric porous structure of the heterolayered nanomat is rationally designed with consideration of the trade-off between leakage current and ion transport rate. The TPY (to chelate Mn2+ ions) and PVP (to capture hydrofluoric acid)-mediated chemical functionalities bring a synergistic coupling in suppressing Mn2+-induced adverse effects, eventually enabling a substantial improvement in the high-temperature cycling performance of cells.
Funding Information
  • National Research Foundation of Korea (2014R1A2A1A11052829, 2015R1A2A1A01003474, 2015R1A2A2A04003160, NRF-2013H1A2A1033278)
  • Ministry of Trade, Industry and Energy (10050568)

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